Sure, that's easy. I do it all the time, and I have two general methods:

In both cases I do it by embedding an iframe in the page.

The first is to just make sure the browser has a plug in for the mime-type associated with that extention.

You might have to put a note on the page that includes the iframe that a plug-in is required, with a link for where to go to get the plug-in if they don't already have it.

In that case, you can call the raw file with it's native extention.

The second is for situations where odds are high that your uses will be using browsers enabled for downloading plugins on the fly, then make it so the page that's being called into the iframe is an html file with some embed code to embed the document in the html file that's in the iframe, and then wrap around it some object code that will fish for the plug-in and automatically load it if it's not already there, i.e., here's how I do it for flash files:

(NOTE: replace the [ with a left angle bracket when actually doing it... this board won't display html source)

[object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="300" height="250" id="whatever" align="wherever">
[param name="allowScriptAccess" value="sameDomain" />
[param name="allowFullScreen" value="true or false" />
[param name="movie" value="flash-file-name.swf" />
[param name="quality" value="high" />

[embed src="flash-file-name.swf" quality="high" bgcolor="#whatever" width="whatever" height="whatever" name="whatever" align="wherever" allowScriptAccess="sameDomain" allowFullScreen="true or false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />

[/object>

Notice how the [embed src...> stuff is what gets the document inserted into the html file, but it's the [object...> stuff that gets the plugin if it's not there already.

There's probably other ways to do it, with javascripts etc., and those other ways will probably be added to your question as more answers, so make a list of them all and choose your favorites, but those two are what works 97.3% of the time for me.

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